Communicating the risks of tobacco and alcohol co-use.

Background: While tobacco and alcohol co-use is highly prevalent across the United States, little experimental research has examined ways to counter such dual use. We developed and tested messages about the risks of co-using tobacco and alcohol among adults who used a combustible tobacco product and drank alcohol within the 30 days.
Methods: In an online experiment, 1,300 participants were randomly assigned to read different messages about tobacco and alcohol co-use (e.g., Alcohol and tobacco cause throat cancer). Three between-subjects experiments manipulated the presence of: 1) a marker word (e.g., Warning), 2) text describing the symptoms of health effects and a quitting self-efficacy cue, and 3) an image depicting the health effect. Participants rated each message using a validated Perceived Message Effectiveness (PME) scale. We used independent samples t-tests to examine differences between experimental conditions. Results include effect sizes (Cohen's d) to compare standardized mean differences.
Results: Our sample was 64% male, 70% white, 23% Black, and 17% Hispanic/Latino with a mean age of 42.4 (SD = 16.4) years. Messages that described the symptoms of the health effect (d = 0.17, p = 0.002) and included an image (d = 0.11, p = 0.04) were rated significantly higher in PME compared with messages that did not describe symptoms and were text-only. We found no significant effects of a marker word or self-efficacy cue on PME.
Conclusions: Messages that describe the symptoms of health effects and include text and images may be particularly effective for communicating the risks of tobacco and alcohol co-use and decreasing adverse health effects from co-use.
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